create file maildrop/606889.614: No such file or directory

[cynen]

hi:
when i was deploy a container such like this:
https://hub.docker.com/r/iredmail/mariadb

echo HOSTNAME=mail.mydomain.com >> iredmail-docker.conf
echo FIRST_MAIL_DOMAIN=mydomain.com >> iredmail-docker.conf
echo FIRST_MAIL_DOMAIN_ADMIN_PASSWORD=my-secret-password >> iredmail-docker.conf
echo MLMMJADMIN_API_TOKEN=$(openssl rand -base64 32) >> iredmail-docker.conf
echo ROUNDCUBE_DES_KEY=$(openssl rand -base64 24) >> iredmail-docker.conf


cd /iredmail
mkdir -p data/{backup,clamav,custom,imapsieve_copy,mailboxes,mlmmj,mlmmj-archive,mysql,sa_rules,ssl,postfix_queue}


docker run \
    --rm \
    --name iredmail \
    --env-file iredmail-docker.conf \
    --hostname mail.mydomain.com \
    -p 80:80 \
    -p 443:443 \
    -p 110:110 \
    -p 995:995 \
    -p 143:143 \
    -p 993:993 \
    -p 25:25 \
    -p 465:465 \
    -p 587:587 \
    -v /iredmail/data/backup:/var/vmail/backup \
    -v /iredmail/data/mailboxes:/var/vmail/vmail1 \
    -v /iredmail/data/mlmmj:/var/vmail/mlmmj \
    -v /iredmail/data/mlmmj-archive:/var/vmail/mlmmj-archive \
    -v /iredmail/data/imapsieve_copy:/var/vmail/imapsieve_copy \
    -v /iredmail/data/custom:/opt/iredmail/custom \
    -v /iredmail/data/ssl:/opt/iredmail/ssl \
    -v /iredmail/data/mysql:/var/lib/mysql \
    -v /iredmail/data/clamav:/var/lib/clamav \
    -v /iredmail/data/sa_rules:/var/lib/spamassassin \
    -v /iredmail/data/postfix_queue:/var/spool/postfix \
    iredmail/mariadb:nightly

when is execute this script ,the console output like this:

< cf-request-id: 04787fefd80000eb258a8f8200000001
< expect-ct: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
postdrop: warning: mail_queue_enter: create file maildrop/611509.614: No such file or directory
postdrop: warning: mail_queue_enter: create file maildrop/611769.614: No such file or directory
postdrop: warning: mail_queue_enter: create file maildrop/612042.614: No such file or directory
postdrop: warning: mail_queue_enter: create file maildrop/612306.614: No such file or directory
postdrop: warning: mail_queue_enter: create file maildrop/612584.614: No such file or directory
postdrop: warning: mail_queue_enter: create file maildrop/612890.614: No such file or director
..........